Resumo

MOLINA MOREJON, Víctor Manuel et al. Technical and economic feasibility of the use of a commercial water heater based biogas in dairy stables. Rev. Mex. Cienc. Agríc [online]. 2020, vol.11, n.2, pp.391-403.  Epub 15-Mar-2021. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v11i2.2078.

The purpose of this work was to analyze the technical and economic feasibility of using a commercial heater that works with biogas to obtain the necessary hot water in the sanitation of the milking area or to heat the milk that feeds the calves in stables of the Comarca Lagunera, Mexico. It is an economic and sustainable alternative to the widespread practice of using electrical resistors or liquefied petroleum gas (LPG) that generates an expense of approximately $300 000.00 pesos per year. The characteristics of the commercial heater acquired were determined using various heat transfer equations. The economic analysis of the investment was carried out over a period of five years using indicators that take into account the value of money over time such as the net present value, the internal rate of return and the cost-benefit ratio. In the experimental test, the energy required for water heating and efficient combustion was maintained. The technical feasibility of the proposal was shown by not rejecting the null hypothesis of equality of means (p> 0.05) of the 45 samples, which implies a consistency in the heating times. The financial analysis, in its different indicators NPV, IRR and R B/C, showed values in project acceptance ranges. This solution reduces the emission of greenhouse gases and production costs in operations. The option of using biogas is technically and economically viable.

Palavras-chave : biodigester; dairy stables; financial analysis; manure; methane.

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